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The St.Type-22, developed Stalker Inc. features a unique pike-nose design, and is the first anti-aircraft vehicle to join the ranks of the company's private military force. The chassis was originally intended for a type of battle-tank in the medium armour class. However, its performance was less than acceptable for the role due to a lack of capacity for ammunition, as well as an insufficiently powerful powerplant. The project was scrapped, and the chassis that had already been produced at that point were fitted with an MK-1a AA turret. The Type-22 would later be replaced by the lighter Type-18.

By the time production of the Type-22 X1 had stopped, 55 chassis had already been produced. These were fitted with the MK-1a AA turret and renamed the Type-22 X2. Testing results were excellent, which resulted the variant to be adopted as a dedicated SPAA-vehicle and officially designated as the St.Type-22.